﻿using DesdemonaDespairApp.Data;

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.Graphics.Display;
using Windows.UI.ViewManagement;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;
using Windows.ApplicationModel.Background;

// The Items Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=234233

namespace DesdemonaDespairApp
{
    /// <summary>
    /// A page that displays a collection of item previews.  In the Split Application this page
    /// is used to display and select one of the available groups.
    /// </summary>
    public sealed partial class ItemsPage : DesdemonaDespairApp.Common.LayoutAwarePage
    {
        public ItemsPage()
        {
            this.InitializeComponent();

            RegisterBackgroundTask();
        }

        /// <summary>
        /// Populates the page with content passed during navigation.  Any saved state is also
        /// provided when recreating a page from a prior session.
        /// </summary>
        /// <param name="navigationParameter">The parameter value passed to
        /// <see cref="Frame.Navigate(Type, Object)"/> when this page was initially requested.
        /// </param>
        /// <param name="pageState">A dictionary of state preserved by this page during an earlier
        /// session.  This will be null the first time a page is visited.</param>
        protected override void LoadState(Object navigationParameter, Dictionary<String, Object> pageState)
        {
            // TODO: Create an appropriate data model for your problem domain to replace the sample data
            var sampleDataGroups = SampleDataSource.GetGroups((String)navigationParameter);
            this.DefaultViewModel["Items"] = sampleDataGroups;
        }

        /// <summary>
        /// Invoked when an item is clicked.
        /// </summary>
        /// <param name="sender">The GridView (or ListView when the application is snapped)
        /// displaying the item clicked.</param>
        /// <param name="e">Event data that describes the item clicked.</param>
        void ItemView_ItemClick(object sender, ItemClickEventArgs e)
        {
            // Navigate to the appropriate destination page, configuring the new page
            // by passing required information as a navigation parameter
            var groupId = ((SampleDataGroup)e.ClickedItem).UniqueId;
            this.Frame.Navigate(typeof(SplitPage), groupId);
        }

        private async void RegisterBackgroundTask()
        {
            var backgroundAccessStatus = await BackgroundExecutionManager.RequestAccessAsync();
            if( backgroundAccessStatus == BackgroundAccessStatus.AllowedMayUseActiveRealTimeConnectivity ||
                backgroundAccessStatus == BackgroundAccessStatus.AllowedWithAlwaysOnRealTimeConnectivity )
            {
                foreach( var task in BackgroundTaskRegistration.AllTasks )
                {
                    if( task.Value.Name == taskName )
                    {
                        task.Value.Unregister( true );
                    }
                }

                BackgroundTaskBuilder taskBuilder = new BackgroundTaskBuilder();
                taskBuilder.Name = taskName;
                taskBuilder.TaskEntryPoint = taskEntryPoint;
                taskBuilder.SetTrigger( new TimeTrigger( 15, false ) );
                var registration = taskBuilder.Register();
            }
        }

        private const string taskName = "BlogFeedBackgroundTask";
        private const string taskEntryPoint = "BackgroundTasks.DesdemonaFeedBackgroundTask";

    }
}
